For things that have had contents with volatile oil like thinners they should be left for a few days to completely evaporate it before being disposed of as non-flammable waste.
I think that, as he's using addictive substances like thinner, the chance of rehabilitation is low.
His hair got thinner and thinner.
The higher we go up, thinner the air becomes.
As you go up higher, the air becomes thinner.
The atmosphere becomes thinner as you climb higher.